Outcomes · Body composition · continued

Ultrasound and skinfolds: operator dependence in practice — what changed since posts 31–38

Outcomes › Body composition data table DXA bioimpedance lean mass loss

This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1.

l.salinasTL23 Apr 2026#31

I would put moderate confidence on the mainstream reading of Ultrasound and skinfolds and no more. That is not scepticism for its own sake; it is where the sourcing actually stops.

17 likes 4mo

a.reyesTL4 Admin6 Apr 2026 · edited#32

This follows post #31 rather than contradicting it.

Photographs under fixed lighting and posture are a genuine record and are the hardest of these to standardise.

Noting that I have skin in this question and have tried to discount for it.

6 likes 4mo

m.ibarraTL28 Apr 2026#33

Coming back to post #31, because the follow-up matters more than the original answer.

Worth separating Ultrasound and skinfolds as a question about the compound from Ultrasound and skinfolds as a question about the documentation. They get answered by different people and only one of them is answerable here.

0 likes 4mo

s.leclercTL4 Moderator11 Apr 2026#34

isotonic_sheet, post #7: Building on post #4 rather than restating it. I keep a log for Ultrasound and skinfolds specifically because my memory of it turned out to be systematically wrong in one direction. Six weeks of notes cost nothing and settled it. Go to post

On Ultrasound and skinfolds: the maintained page in the documentation commons covers the general case with citations and a review date, which is more reliable than any reply here including this one.

32 likes in reply to #7 4mo

p.mbekiTL214 Apr 2026#35

Bioimpedance is considerably less precise and is strongly affected by hydration state, which is why readings move overnight without anything having changed.

11 likes 3mo

b.solbergTL217 Apr 2026#36

Answering the Ultrasound and skinfolds question as asked, then the question I think is meant. As asked: yes, with the qualification below. As meant: it depends on how the first measurement was taken.

3 likes 3mo

j.steinerTL220 Apr 2026#37

k.farrugia, post #12: Picking up post #9: that is the part I would want checked first. Where I have landed on Ultrasound and skinfolds, having got it wrong once in public: the direction is clear, the magnitude is not, and anyone quoting a precise magnitude has borrowed it from somewhere that did not measure it. Go to post

I had written a reply contradicting post #35 and deleted it. Here is what survived.

Nobody has said the unglamorous part of Ultrasound and skinfolds yet, so: most of the variation is explained by things that are boring to write about and easy to check.

0 likes in reply to #12 3mo

n.moreauTL223 Apr 2026#38

p.novak, post #4: Where I part company with post #2, and it is a narrow parting. Photographs under fixed lighting and posture are a genuine record and are the hardest of these to standardise. Correct me on the arithmetic if it is wrong; I would rather know. Go to post

Acknowledging rather than arguing. The reasoning holds as far as I can follow it.

24 likes in reply to #4 3mo

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